Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8c2fb1a277c1cea…

MALICIOUS

PDF

69.3 KB Created: 2021-09-01 21:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 50d5ebc204d4445f1875e78614198ced SHA-1: 778431696706528a0d1101517555487604fd962d SHA-256: d8c2fb1a277c1cea3233eb9b2b4186db8602e6ee7847968494183eef4849a548
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or appear to be part of a link farm on disposable hosting. The PDF's structure and the presence of these links suggest it is designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://sahyadrisevasanstha.in/userfiles/file/56346388583.pdf In PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/39162453464.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/8712254663.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7f78bc601---gubus.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc589ceb50a---nuvavuvubajepiterivat.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/21096713817.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16125794c73bf4---sowuvew.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/42434834452.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/a4249a9abd399f4480b90a874edd886a/zawuwavakuxubulagilason.pdfIn PDF document text
    • https://mbbs.hr/files/42306657417.pdfIn PDF document text
    • http://blsfamilyreunion.com/clients/1/11/11e20eb1c47c3498ff3e66fc1941d138/File/kevumojijuvaxutijodew.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/gogil.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609850fa65d27---74620808164.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/34811837882.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/bubero.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/zugelitod.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/qr0cqpgao5i8esodmnuu4jvpv8/lijosega.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3928d190ce---80534439750.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/5bf9d714c4fd6e7a7aea9fca8bff5b07/rugoku.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/47079823704.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/pubukoxovigopos.pdfIn PDF document text
    • http://christopherdallo.com/file/71248501381.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202108301300379744.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/31728446998.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/33076995784.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=freedom+of+educationPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB370 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB82 14920 bytes
SHA-256: 7e3fd5eb7fa60dbaf5a065ded80b8218f04de83b68dcdd34cf5b21c9d8704ca7
font_02_sfnt_off0000f0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C2 10500 bytes
SHA-256: e28583f9f45579045048e146b9c56f185afe0c052f956c51b4dff1c648f4a27a

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